 Number and Geometry  James Garner
An essay on the historical relationship between numbers and geometry.
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 Number and Word Puzzles  Ken Egan
Number and word puzzles, including Digicross, in worksheet and interactive (Java) format.
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 Number Bases  Math Forum, Ask Dr. Math FAQ
What is base 10? Binary? Hexadecimal? How can you convert from one base to another?
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 Number Bender  Peter Esperanza
Freely downloadable algebra, precalculus, and AP statistics presentations and worksheets by an Ed.D. candidate who has taught in China, the Philippines, and the U.S.
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 Number Dictionary  Gerardis Giannis, Tsibourakis Dimitris
Enter a number to see its characteristics, such as primality, Fibonacci numbers, factorization, sum of first primes, sum of two squares, triangular numbers, roots, perfect numbers, and more...
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 The Number Empire  Vitalii Vanovschi
Enter a positive integer up to 10^12, press the "Go!" button, and The Number Empire states  in yes/no format  whether you entered a prime number, a Bell number, a Catalan number, or a factorial. The same single click displays the integer written out
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 A Number Game  Zusheng Rao
Imagine this interesting game. Given 9 numbers (1,2,3,4,5,6,7,8,9), can you make a number like 1997 by using these numbers and +  * operations without changing their positions? This applet can tell you: put 9 in the column corresponding to "Max Number"
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 Number Glossary  Math Forum, Ask Dr. Math FAQ
What are abundant, amicable, deficient, figurate, happy, narcissistic, palindromic, perfect, polygonal, proper divisors, semiperfect, sociable, square, tetrahedral, triangular, and weird numbers?
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 Number Gossip  Tanya Khovanova
Searchable database up to the number 10,000. Checks more than 40 fun predefined properties of numbers, and shows many original and unique properties of an input number. See also this math coach's math blog, lectures, and more from her home page.
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 Number Guessing  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Think of a number and answer a few questions posed by the computer. After a while the compter will announce your number. The trick is based on a special card design whose variations appeared more than a hundred years ago.
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 Numbering Systems and Place Values  John Knoderer, The MazeMan
Primarily a page about large numbers. Topics covered include: Place Values, ones up to trillions; Place Values, tenths down to trillionths; the American Numbering System; Googol and Googolplex; and the British Numbering System.
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 numbermaze  Mike Reilly & Jenks Norwalk
A Sudokulike maze puzzle that uses the number pattern from a clock face, one through twelve. Link these numbers in either direction – clockwise or counterclockwise – through the maze to solve the puzzle. Read complete rules, path strategy, hints, and
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 Number Patterns  Harvey Heinz
A brief description of why mathematics is often called the science of pattern followed by examples of a variety of magic squares of various types; examples of orders 5 to 12d magic stars, and selections from Heinz's collection of over 400 number patterns
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 Number Patterns in Pascal's Triangle (SMILE)  Ulysses Harrison, Dunbar Vocational High School
A lesson for grades 5 and up designed to enable students to recognize the integers, rows, and columns that comprise Pascal's Triangle. The main objective of the lesson is to enable students to reproduce the first eleven rows of Pascal's Triangle by recalling
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 Numberphile  Brady Haran
Playful primer videos "about numbers and stuff," typically less than ten minutes long. Watch mathematicians talk about Benford's Law, favourite numbers (in response to a poll conducted by Alex Bellos), spaghetti numbers, Curta calculator, vampire numbers,
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 Numberplay  The New York Times
Mathematical, logical and scientific puzzles, with solution "recaps." The posts, by Gary Antonick and Pradeep Mutalik, have included "Surreal Hat Tricks," "The Puzzles of Pickover," "Prime Rib at Hogwarts," "Nim for (a) Change," "Phi  The Magic and the
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 Number Puzzles  Erich's Puzzle Palace; Erich Friedman
Three crosswordgrid style puzzles, with numerical operations filled in. Can you fill in the numbers that work? Answers provided.
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 Number Server  Ben Coffey
A RESTlike service offering a variety of data for decimal and binary numbers: enter a number and get its sine, cosine, tangent, natural logarithm, square root, square, cube, binary, hexadecimal, octal, the singledigit sum of the digits, and more. Output
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 Numbers from 1 to 10 in Over 4000 Languages  Mark Rosenfelder
Click on the map to move to the languages for that area, or select from: IndoEuropean, Dravidian, and minor European languages; AfroAsiatic, Caucasian, NiloSaharan, Kordofanian, and Khoisan languages; NigerCongo languages; Uralic, Altaic, Tai, AustroAsiatic
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 Numbers from One to ThirtyOne: A Page for Each Day of the Month  Richard Phillips, Shell Centre for Mathematical Education
Trivia about the calendar numbers one through thirtyone. Based on the book Numbers: Facts, Figures and Fiction, which answers questions such as how Room 101 got its name, what you measure in oktas, and which number links Alice in Wonderland, rainbows
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 Numbers in the World (Math Chat)  Frank Morgan, MAA Online
Select the best occurrence in the world of each number from 1 to 10. For example, 12 is the number of eggs in a dozen or the number of months in a year... with winning reponses. Also: Math Chat has received a number of mathematical jokes, most of them
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 Numbers (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
Links to sites about particular numbers; dates; palindromes; Gaussian integers; Carmichael numbers; continued fractions; e; Egyptian fractions, mathematics, and numerals; constants; Fermat; Fibonacci numbers; pi; large numbers, sequences, prime numbers,
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 NumberSpiral.com  Robert Sacks
Instructions, observations, formulas, and a glossary about number spirals, formed by writing the nonnegative integers on a ribbon, rolling it up with zero at the center, and arranging the spiral so all the perfect squares line up in a row on the right
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 Number Theory  Alex LópezOrtiz and the Sci.Math FAQ Team
Links to information on: Fermat's Last Theorem (History of Fermat's Last Theorem; What is the current status of FLT?; Related Conjectures; Did Fermat prove this theorem?), and Prime Numbers.
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 Number theory  Dario Alpern
A collection of calculators, tables, and articles about number theory, with an applet that is able to factor large numbers and a quadratic diophantine equation solver.
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 Number Theory (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
An extensive list of links to sites with information about number theory, classified by level and type of resource.
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 Number Theory (MathPages)  Kevin Brown
More than 100 "informal notes" by Kevin Brown on number theory: linear recurring sequences, Zeisel numbers, Wilsonian primes, arithmetic progression, sublime numbers, square triangular numbers, and many more.
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 The Number Warrior  Jason Dyer
Blog by an algebra and calculus teacher. Posts, which date back to January, 2008, have included "The Educational Problem with Teaching Multiplication as Repeated Addition," "Nonlinear lesson design (Giant Ants of Doom)," "The design of mathematical notation,"
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 Number Watch  John Brignell
"All about the scares, scams, junk, panics, and flummery cooked up by the media, politicians, bureaucrats, socalled scientists and others who try to confuse you with wrong numbers." A site devoted to the monitoring of the misleading numbers that rain
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 Number: What Is "How Many"?  B. Sidney Smith; Math Academy Online/Platonic Realms
A "minitext" introducing fundamental concepts in elementary number theory and the foundations of mathematics. Includes discussions of basic set theory; natural numbers; integers; rational, irrational, and real numbers. Also gives a brief list of suggested
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 The Number Years  Libicki, Quinn
A concept originally created by Eric Libicki as a classroom activity to bring a sense of fun to learning the history of mathematics, now in the game show format presented here. Several online versions are available, and users will be able to craft their
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 numeracy  Adult Numeracy Network, Math Forum
A mailing list for those interested in the discussion of educational issues around adult mathematical literacy (ABE/GED/ESL, workplace, and literacy teachers, tutors, and adult learners), maintained by the Adult Numeracy Network (ANN). Read and search
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 Numeracy and Quantitative Literacy  EXTEND  Perspectives in Mathematics Education
Links to articles on diverse views on the quantitative demands of today's society and the relation of quantitative literacy to mathematics education.
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 Numeracy in the News  The Mercury/University of Tasmania
Newspaper articles collected from the Tasmanian (Australia) metropolitan daily newspaper, The Mercury, to represent the five areas of the Chance and Data curriculum (Data Collection and Sampling, Data Representation, Chance and Basic Probability, Data
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 Numeracy Works  David Hartmann, Numeracy Works LLC
Numeracy Works is a commercial software company which sells Tabula, a new tool for math education. Use Tabula to create, construct, cut, tape, fold, and transform. Make fold patterns, tiling patterns, tessellations, and perspective drawings. Also on
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 Numerical Analysis  JeanPierre Moreau
Numerical analysis source code in BASIC, C++, FORTRAN, or Pascal. Program topics include real and complex roots, evaluation of Bessel functions, signal processing, matrices, and statistics.
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 Numerical Integration: Accumulating Rates of Change  Geometry Center
The fundamental theorem of calculus tells us that if we know the rate of change of some quantity, then adding up (or integrating) the rate of change over some interval will give the total change in that quantity over the same interval. But often scientists
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 Numericana.com  Gérard P. Michon
The online companion of Numericana, this site contains excerpts from Michon's book, including the entire glossary of scientific terms. Browse an index with pithy summaries, browse by popularity, or search nearly two hundred of his "final answers" of readers'
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 Numericon  School of Mathematical Sciences, University of Technology, Sydney, Australia (UTS)
Mostly elementary presentations of: Numbers we've all heard of; Perfect numbers; Facts about prime numbers; Australian cricket's 25 leading allrounders; Pythagorean triples; Pi in the sky; 73939133; and Fermat's Last Theorem.
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 Numeric Tests Solver  The IQ Challenge
Enter an integer sequence, and this program attempts to determine the next number in the sequence. It
is based on artificial intelligence algorithms.
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 The Numerist  Shaun Klassen
Math tutorial posts by Klassen, who majored in biochemistry and holds a Master of Science degree specializing in medicine. "Explanations of as many math concepts that I can think of" include Finding the Slope of a Line," "Introduction to Functions," "The
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 Nummňlt  Maurici Carbó Jordi
Java applets: an area "workshop," which explains area and division by converting numbers in area units; an architect's toy blocks, with gravity; connecting and programming elementary logic (in the form of pipes with light bulbs signifying true sentences);
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 Nummòlt  Maurici Carbó Jordi
Math teaching resources built by architects include base 10 block manipulatives; a block construction toybox; a logic construction toybox; an area workshop; and MathCats balance. See, in particular, Nummòlt's openended obbl & math toys: adding
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 The Nursing Files  Math  The Wayfarer
Answers to nurses' questions about math, and formulas nurses are expected to know everyday. Learn about tables of equivalents, terms (measures of weight, volume, capacity, and length), dosages, ratio solutions, intravenous (IV) flow rates, percent solutions,
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 NYC HOLD  Bas Braams and Elizabeth Carson, editors
Honest Open Logical Debate (HOLD) on Mathematics Education Reform addresses mathematics education in the New York City schools. Organized into Issues in Mathematics Education, Curriculum Reviews, Standards, New York City Issues, Call to Action, NYC News
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 nysmathab  Math Forum
The discussion group of the Association of Math Teachers of New York State dedicated to the "Math A" and "Math B" Assessments. Teachers, administrators, NYSED personnel, and anyone interested in this NY statespecific topic are encouraged to take part.
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 nysmhs  Math Forum
The discussion group of the Association of Math Teachers of New York State's Math Honor Society. All NYSMHS members are encouraged to join this group, as are others who wish to converse about statewide math honor societies. Read and search archived messages;
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 Occam Press  Peter Schorer
"The skeptical mathematician is invited to improve upon the current implementations of the 3x + 1 strategy...." In addition to the Collatz conjecture, Schorer offers a simple proof of Fermat's Last Theorem, articles on Occam's Razor and programming,
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 Occupational Outlook Handbook  U.S. Bureau of Labor Statistics (BLS)
Career information and statistics about many different jobs, such as mathematicians. Each outlook includes a description of the nature of the work, working conditions, number of people in a field and sources of employment, training, other qualifications,
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 Occupational Outlook Quarterly Online  U.S. Bureau of Labor Statistics (BLS)
A journal about jobs and careers covering new, emerging, and unusual occupations, training opportunities, salary trends, results of new studies, etc. Includes summaries and excerpts from articles, with full text available for download in PDF format and
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